Owain Gwynedd (in English, "Owen") (c. 1100–November 28, 1170), alternatively known by the patronymic "Owain ap Gruffydd". He is occasionally referred to as Owain I of Gwynedd, or Owain I of Wales on account of his claim to be King of Wales. He is considered to be the most successful of all the north Welsh princes prior to his grandson, Llywelyn the Great. He was known as Owain Gwynedd to distinguish him from another contemporary Owain ap Gruffydd, ruler of part of Powys who was known as Owain Cyfeiliog. Owain Gwynedd was a member of the House of Aberffraw, a descendant of the senior branch from Rhodri Mawr.